I managed to fix this by using gnome-disks to format the ext4 partition instead of initially using GParted, as well as ensuring the Dropbox directory was placed at a 2-level depth of the mount point of the partition. Once I fixed all these things, Dropbox finally allowed me to move the target folder and the error messages about "unsupported file system" disappeared. The target folder (or Dropbox sync folder) needs to be at least two levels beneath the mountpoint, as described in this post.The ext4 partition needs to be mounted with the user_xattr option set (You can check for and add the option in GNOME disks or edit /etc/fstab directly).This is the default behavior, but you can confirm by running debugfs -R features /dev/sda1 (or whatever your device file is called - if you're using LVM it might be something like /dev/mapper/computername-vg-partitionname) The ext4 file system needs to be formatted with ext_attr on.if your home folder is encrypted, you need to put the Dropbox folder someplace else, eg. The base file system needs to be ext4, and specifically not ecryptfs. What I'm summarising here worked for Dropbox 59.4.93 on Ubuntu 18.04.1 (amd64). There are three things in total that Dropbox requires to continue working on Linux, and only one is properly documented.
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